Telling him my feelings about him....

So there's this guy that I've known and been talking to for the past four months. Everytime I talk to him he always makes me feel so damn happy and glad to know him! We talk very often and he's just amazing. Everyday I feel as if I'm started to get feelings for him more than friends but I'm a bit scared and nervous to tell him as I don't know what he's feelings are, what do you think I should do? Do you think I should hold off, tell him or wait off until something may happen? It would be my first relationship as I'm sixteen so I would really appreciate any advice, thank you xx